Machine for molding concrete pipe



sept. 15,1925 l 1,553,842

` E. L. WARNER MACHINE FOR MOLDING CONCRETE. PIPE- I Filed quae 2e. 1924 {u} A i l 6( /e A du 6% N l 65- vmmmoz eo Edgar L. 'Warner Patented Slept. l5, 1925. l

UNITED STATES PATENT OFFICE.

EDGAR L. yIAIRNER, OF SEATTLE, WASHINGTON, ASS'IGNOR T0 CONCRETE PIPE COM- PANY, oF SEATTLE, WASHINGTON,

A CORPORATION F WASHINGTON.

MACHINE Fon MoLnING coNcEE'rE PIPE.

Application led I une 26, 1924. Serial No. 722,449.

To all whom 'it may concem:

Be it known. that I, EDGAR L. WARNER, a citizen of the United States of America, and resident of the city of Seattle, in the countyof King and State of Washington,

in the art of molding pipe and the like particularly concrete pipe, such as is` emp oyed for sewers and drains.

Sewer pipe prepared by methods and equipment heretofore ordinarily in use, has come from the mold with a roughened edge projectin inwardly at the inside of the small'en of belled pipe, and asV the roughened edge interrupts the otherwise smooth interior of the pipe and was liable to form suchan obstruction las would catch straws and other debris, consequently fouling and finally obstructing thepipe, it has been necessary heretofore to ream out thisl edge of the pi e and to smooth down the rou hened edge ibrmed thereon. This require considerable time and labor and'it is oneof the objects of my present invention to avoid the necessity for such reaming or' smoothmg operations. An important object, then, is the provlsion of a novel combination of pipe molding machinery, including a novel pallet, which lwill form the plpe complete and ready for use without' further operations thereon. v

A further object is the rovision of means whereby the pipe may molded with a chamfer or like space to receive the sealing cement which is forced into the -pi e and which must be smoothed orswabbe down after the pipe is set. 4

`Inahsmuch as the investment in pallets 1n a concrete pipe plant is considerable and their aggregate weight and bulk is lar e, it is my object to cutdown the' size o the pallet and its weight, and consequently reduce the investment necessary to be made 1n such allets. t

A urther object is the provision of such a pallet for use in pipe molding machinery, which is provided .with means to prevent tilting of the pallet after it is placedupon` manner to prevent the formation of pipe with ends inclined other than at right angles to its axis.

My `invention comprises the novel pallet and the novel combination of molding machinery including the same, as shown in the accompanying drawings, described in this specification and particularly defined by the claims terminating the same.

Figure 1 is a section through the essential portions of the pipe-molding machinery, showing an embodiment of my invention.

Figure 2 is a plan View of my novelpallet and Figure 3 is a section on line 3--3 of Figure 2. j

e As is common in such pipe-moldin machinery, .I employ a turntable 1 which is suitably rotated, as by a belt v10 running over a pulley 11, the pulley and turntable being secured upon a common shaft 12. Above the turntable is suspended a core 2, this being generally cylindrical and preferably being supported from a square rod 22, suspended-as by arope21, the square rod 22 passing through a correspondingl shaped aperture in la bracket 20. By suc Y means the core may be kept from rotation, although in certain aspects of my invention it is not essential that the core be nonrotaltive. The form 3 is positioned'about the core 2 and preferably rests upon and rotates with the turntable 1.A It will be understood that these members are Vcommon in the art and may assume any form therein not incompatible with the use of my im roved pallet, to be described hereinafter. lso it is common in such machinery to provide a tamp stick 4 reciprocable in the space between theform 3 and core 2, to pack the concrete entering through the chute 5. Thev `tamp stick Vmay be operated through a crank 40 rotatable by means of a pulley 41 secured the end of the core 2 rests upon this upper surface. While the-upper surface -60 of my pallet is, in general, plane, yet it is formedv with means at its inner periphery for forming upon the molded pipe a chamfer, which is taken out of the inner lower edge of the pipe.' Forthis purpose a bead 61 may be formed at the inner periphery of the ring- -like pallet 6, this bead extending above the general plane of the pallet and preferably Apallet and of a radius corresponding tothe central aperture 62 of the pallet.

The central aperture of the pallet is of a diameter corresponding to the diameter of the core 2, at least of its lower end, and the core thus is fitted within the aperture 62 and does not rest upon the surface of the pallet. Thus the upper edge oi the bead 61 lies immediately adjacent the peripheral surface of the core 2, above its end. Material entering the form will be forced outwardly by the bead 6l, but if a thin film should form between the bead 6l and the core 2, this thin film in any event extends longitudinally of the pipe and thus does not form an inwardly projecting roughened ledge, but also in knocking loose the pallet., as is necessary in any event afterlthe concrete of the pipe has set, this thin ilm will be knocked loose and removed. The inner lower edge of the pipe thus is self-cleansing and is formed with a cliamfer which' when thepipc is set in place may receive the cement which is smoothed or swabbed down from the inside, thus additionally serving to maintain the inside surface' of the sewer smooth and unobstructed, and nonleaking.

rllhe pallet is generally supported upon feet 63, which support the rear of the pallet slightly above the surface oi' the turntable. lf it should happen iii lowering the core 2 that it should strike the bead 6l at one side, instead or entering the aperture 62, this might tend to tilt the pallet, and in order to avoid this l have provided a plurality of lugs 64 likewise spaced angularly about the central aperture 62 and projectin' thereinto, 'which are adapted to be engagedby the side of the core 2 opposite that which engages the bead 61, and th'us further downward pressure of the core 2 ,will return the pallet 'to its'norrnal level position and cause it to center itself. Such devices are unnecessary with present pallets, inasmuch as the core now rests upon the pallet itself. `When in nal operative position, the core 2 has its lower end at about the level of the upper surfaces of shoulders 65 of the lugs @4, although preerabl-l it does not rest thereupon. These shoulyders 65 merely serve to maintain the pallet level by preventing tilting relative to the core 2. K

By forming the pallet only of a width to .tit between the core and form, rather than of a width to extend beneath the core, its width is considerably reduced, and its weight and cost are correspondingly decreased. This ellects a considerable saving in large plants. |The saving of time required to nish the pipes after removing them from the molds,

by eliminating the necessity for reaming their inner edges, also effects a large saving.

What I claim as my invention is:

l. ln machinery for molding pipe, a turntable, an axially apertured pallet adapted to rest thereon, a core axially positioned relative to the turntable and pallet, its lower end being receivable within the aperture of the pallet to be closely embraced thereby, a form surrounding said core and said pallet` angular-ly spaced feet supporting said pallet, and angularly spaced positioning lugs thereon projecting within the central aperture oity the pallet, and positioned immediately beneath the lower end of the core when the latter is in operative position.

2. In machinery for molding pipe, aturntable, an axially apertured pallet adapted to rest thereon, a core axially positioned relative to the turntable and pallet, its lower end being receivable within the aperture of the pallet to be closely embraced thereby, a form surrounding said core and said pallet,

-angularly spaced feet supporting said pallet, and angularly spaced ositioning lugs thereon projecting within t e central aperture of the pallet, and postioned immediately beneath the lower end of the core when the latter is in operative position, and an upwardly and inwaildly ery.

3. A pallet for use in molding pipe comprising a ring of a width corresponding to the thickness of the pipe wall, angularly spaced supporting Jfeet beneath said pallet, and positioning lugs projecting within the central aperture of the pallet and beneath its upper surface.

Ll. A., pallet 'for use in molding pipe comprising Ia' ring of a width corresponding to the thickness of the pipe wall, and having a generally plane upper surface, a bead about its central aperture linclined inwardly and upwardly to terminate in a sharp edge above the surface of the pallet and coinciding in radius with its aperture, singularly spaced' supporting feet beneath the pallet, and angiilarly spaced positioning lugs projecting within the central aperture and lying beneath the upper edge oi* said bead;

Signed at Seattle, King County, `Wash ington, this lith day oit dune, 1924s L.. WARNER.

inclined bead formed upon said pallet at its inner periph` 

